Transmitting tube socket



Feb 9, 1954 R. LEOPOLD ET Ax.

TRANSMITTING TUBE SOCKET 2 Sheets-Sheet 1 Filed Dc. 51, 1949 d0 HT www mmm Y www? 2, e FH n P w 0% U0 HH/..76 Y B Feb- 9, 1954 R. LEOPOLD ET AL TRANSMITTING TUBE SOCKET 2 Sheets-Sheet 2 Filed DeC. 3l, 1949 F ig.

llllllll Il INVENTORS RUDOL F LEOPOLD 0nd BY JSEPH FI. UA SAME-NTO P Mfpmff I'IIIIIIIII l'llllllllll Fig. 3

Patented Feb. 9, 1954 OFFICE TRANSMITTING TUBE SOCKET Rudolf Leopold, Oakland, and Joseph Rf., mento, West New York, N. J., assignors to A en B. Du Mont Laboratoriesjlnc., Passaic, N. corporation oi' Delaware Applialil! December 31 .1949ik SSfFial. Nqr 135,396

1 Claim. l

rl'his invention relates to sockets for electron discharge devices and particularly to the connecting members for the electrode connecting pins extending from theglass base of the discharge device.

It is well known that in electronic apparatus designed to operate at frequencies of the order of one-hundred megacycles or more, the connections between components in the circuits should be as `short as possible. This isl particularly true Qt components connected to the amplifying tubes, and one means by which these short connections to, the tubes may be eected is by eliminating the tube socket, which is standard in most low fre-- quency tubes, and connecting directly to the pins at a point near where they arey sealed to the tube. There is no difliculty in making these connections to low power tubesy where the currents are comparatively Small, but for larger power transmitting tubes, such as for instance the present day type iX-500A it is necessary that the connecting devices be both short and ilexible in order that strains set up by the heating action or" the large currents will not crack the glass seal of the tube. This is particularly true of the pins to which the lament is connected. Another important consideration in these transmitting tubes is that the socket must support a considerable weight and must therefore be of rigid construction.

It is one object of this invention to provide an improved tube socket.

The second object is to provide an improved socket for high frequency transmitting type tubes.

A third object is to provide a rigid socket having adjustable pin connectors.

Other objects will be apparent to those skilled in the art after studying the specification. together with the drawings, in which:

Figure 1 is a perspective view of a transmitting tube and its socket;

Figure 2 is a bottom View of the socket showing an arrangement for two tubes; and

Figure 3 is an enlarged side View, partially in cross section, of a pin connector as used in the sockets of Figures 1 and 2.

In Figure l a transmitting tube I is shown in position to be inserted into its socket. The pins i2 and Iii of the tube rit into the socket connections I4 and IB respectively and. the metal ring on the tube is held by a spring con nector ring i8. This spring connector ring it is securely attached as by soldering to a plate i9 which is separated from a second plate 2| by a sheet of insulating material 22 such as mica.

g The two plates It, and 2l held. together by a ,number of insulated bolts 23- .ligure 2, 4shows the socket rfrom the weer .Side Provisions for two tubes are made in this socket, 511.10 9h55@ tubes may D? Operated in a PWM-Pun circuit although a two-tube socket is not necessary morder to carry out this invention. The two pairs of connectors I4 and I6 are shown as filament connectors and are located in plates 24 and 26 having terminal posts 21 and 28 respectively to which the connections from a filament transformer (not shown) mayl be made. The plates 24 and 26 are separated from the plate 2| by insulating sheets 2 9 and 3| which are similar to the insulating sheet 22 of Figure 1.

In Figure 3 a connector (I4 or- |6) is shown greatly enlarged. The pin |4 consists of a tubular member 34 having an end flange 38 and another flange 3l, longitudinally spaced a short distance therefrom. This spacing is not critical but is slightly greater than the thickness of the plate 24. The tubular member 34 is slotted with a plurality of longitudinal slots forming a plurality of longitudinal resilient ngers beginning at a point below the second flange 31 and continuing to the lower end, i. e., that end not anged.

As may be seen in Figure 3, the outer diameter of the body portion of the tubular member 34 is less than the diameter of the opening 42 in the plate 24. This permits the connector to move laterally with respect to the plate and compensate for structural or manufacturing Variations in the tube pin location and also for the difference in the coeiiicient of expansion of the metal plates 24 and 26 and the glass base of the tube I| which would set up strains that might easily crack the tube if the pins were held in a iixed position.

The inner rim of said tubular member 34 at the end adjacent the flange 36 is preferably beveled to facilitate the entry of the pin I2. The interior thereof is taper reamed or bored so that the inner diameter is larger than the external diameter of the pin |2 adjacent the beveled end, but is smaller than the diameter ot the pin |2 at the other end of the tubular member. Thus the pin i2 may be easily inserted into the beveled end, encountering an increasing amount ci frictional resistance, so that it is held by friction and the spring tension of the resilient fingers, making for better electrical contact.

In assembly, the slotted end of the tubular member 34 is inserted into an opening 42 provided therefor in the plate 24 and since the ilange 3l' has a diameter smaller than the din under side of the plate 24 and form a good bea-ring surface for a resilient collar 4I which is snapped over the flange 3l. As is shown in Figure 3, the collar 4I is warped so as to apply pressure to both the dat washer 39 and the ange 3l. The connector I4 can then move laterally or radially in the plate 24 but cannot move axially with respectthereto.

Since the thickness of the sheet metal forming the plate 25 may not be held to close tolerances, it may be desirable to counterbore a portion shown as the portion 39 in Figure 3 adjacent the opening 42 in which the connector' I4 is mounted. By counterboring the portion 38,

it is possible to achieve any desired accuracy in the plate. In order to form better electrical conductors al1 of the parts of the conector I4 and the plates I9, 2| and 24 may be silver plated, if

' desired.

Modifications of the invention may be apparent to those skilled in the art, Without departing from the scope thereof.

What is claimed is:

A socket for a pair of high frequency transmitting tubes, said socket comprising a flat plate having a pair of socket openings adapted to receive and make mechanical contact with an end portion of said tubes, a pair of nat plate members secured xedly to said rst named plate and parallel therewith with corners overlapping said socket openings, each of said flat plate members having holes therein at said corners, each of said holes having a pin connector mounted therein, each said pin connector being capable of limited radial movement in said holes a rst radial flange extending outwardly from each said connector on one side of said plate member to prevent axial movement of said con nector through said hole in one direction, a spring collar encircling said connector on the other side of said plate member, and a second radial lange axially spaced on said connector from said first ange, said collar interlocking with said second iange to restrict axial movement o1D said connector in the other direction, each said connector having a longitudinally slotted portion forming resilient lingers to grip said pins by spring tension.

RUDOLF LEOPOLD.

JOSEPH E. cAsAMENTO.

References cited in the fue or this patent UNITED s'rATEs PATENTS Number Name Date 1,797,766 Frye Mar. 24, 1931 1,916,194 Godley July 4, 1933 2,284,222 Miller May 26, 1942 2,312,181 Matthews Feb. 23, 1943 2,486,285 Hurst Oct. 25, 1949 2,550,237 Franklin Apr. 24, 1951 2,552,456 Probeck May 8, 1951 FOREIGN PATENTS Number Country Date 586,415 Great Britain Mar. 18, 1947 

